University:
Indiana University South Bend
Course:
BIOL-L 101 | Introduction to Biological Sciences
Academic year:

2021
Views:

25

Pages:

1
Author:

Rose G

Polysaccharides CELLULOSE • BIOLOGICAL MOLECULES made of B-glucose monomers nas straight unbranened chains •Chains run parralell to each allowing H-conds to form cross linkages berween adjacent crains 4 there are many H-bonds adas conective siregnin • cellviose molecules grouped to form microfibrils which are arranged in barralell groups fibres cellulose is suited to providing Support & riagity because its made from B-glucose- forms long straight unbranched chains *nydrogen crass linkages -aad collective stregnin grouped to form microfibrils then grouped again to form fibres-provides more siregnth Proteins amino acid monomer unit R-C-H - amino group carboxy group -nyaragen atom 00-HR-group R C-C-N H R 01 C-C-N H H HO 4-0 H Lipias • insoluble in water soluble in organic solvents eg alconal. Role prospholipias contribute to flexibility { transfer of lipia soluble supstances across cell membrane source of energy water proofing insoluble in water insulation they're slow conductors of neat retain boay neat protection its stored around organs. Phospholipids The emulsion test 1 aad 2cm³ of sample & Scm³ of ethanol together in a test tube 2 snake tube through to dissolve lipids 3.000 5cm² of H₂O & snake gently 4. a milky-white colour indicates lipid. 5 as a coniral repeat with Just HeO solution snovia remain clear. Triglycerides •made from 3 fatty acids $ 1 glycerol *each fatty acia forms an ester bond with glyceral in condensation reaction. CH₂OHHOOC Fatty acid CHOH-HOOC-FOH y acid CHLOHHOOC-FOHy Ocid mydrophilic (H₂OO-fatty acid CH.00-Faný acid nyaroonabic all triglycerides nave the same glycerol so differences come from variations in fatty acids * all fatty acids nave carboxyl group (cook) with an attached nydrocarbon chain phosphate-Che nyarophilic nead interacts with H₂O but not fat nydrophobic 'tall' interacts with far Dut not water its a polar molecule so can form Dilayer primary the sequence of amino acids secondary nydrogen bonds causing polypeptide chain to twist e-g-a-neix tertiary furner folas of secondary struc neia by, lonic bonds, disulfide bridges, Η nydrogen ponds quaternary 2. polypepride chains link saturated no c-cacubae bonds Monounsaturated a single c-C polyunsaturated more than one C-C HO ---mono unsatur- C-C-H ared HH How struc. relates to properties -high ratio of energy storing (-H bands to - low mass to energy rano Penergy in volume Catoms good energy -large & non-polar not affect H₂O potential frario of Hio O atorms release Hel when oxidised